CN117268742B - On-line detection device and detection method for breather valve - Google Patents
On-line detection device and detection method for breather valve Download PDFInfo
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- CN117268742B CN117268742B CN202311551579.6A CN202311551579A CN117268742B CN 117268742 B CN117268742 B CN 117268742B CN 202311551579 A CN202311551579 A CN 202311551579A CN 117268742 B CN117268742 B CN 117268742B
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- 230000008859 change Effects 0.000 claims description 7
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- 238000005086 pumping Methods 0.000 claims description 5
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- 238000012986 modification Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
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Abstract
An online detection device and method for a breather valve belong to the technical field of valve detection. The mounting frame is detachably mounted on a breather valve mounting tube of the air storage tank, the flexible air storage unit is mounted on the upper side of the mounting frame, a closed detection cavity is formed between the flexible air storage unit and the mounting frame, the breather valve is positioned in the detection cavity, the test tube is sequentially connected with the first ball valve, the flowmeter and the pressure switch in series and then is communicated with the detection cavity, and the pressure transmitter is connected with the second ball valve in series and then is communicated with the detection cavity; the camera detects the opening heights of the inspiration end valve disk and the expiration end valve disk of the breather valve, and the anemometer measures the air flow rate at the outlet. The on-line detection device for the breather valve can realize on-line detection of the breather valve, is convenient to detect and operate, and does not influence the normal use of the air storage tank; the detection method can detect the positive pressure opening pressure, the negative pressure opening pressure, the ventilation volume, the leakage volume and the opening height of the breather valve, and ensure the accurate detection effect of the breather valve.
Description
Technical Field
An online detection device and method for a breather valve belong to the technical field of valve detection.
Background
The breather valve is a general term after the exhalation valve and the inhalation valve are integrated, and mainly comprises a valve body, a valve disc, a valve seat, a valve rod, a guide sleeve and the like. The exhalation end and the inhalation end of the breather valve are usually coaxial structures, and the exhalation end and the inhalation end can also be parallel structures. The opening pressure of the breather valve depends on the weight of the valve disc.
The breather valve is usually used on an ordinary pressure or micro-pressure petroleum storage tank, and after the breather valve on the petroleum storage tank is used for a period of time, the breather valve needs to be detected to evaluate the working state of the breather valve.
The utility model patent CN106224631B discloses a breather valve on-line detecting device and method, which detects positive pressure opening pressure by pressurizing the inside of a storage tank by an air compressor, and detects negative pressure opening pressure by covering a vacuum pressure cover on the inside of the tank of the breather valve, but this mode is not safe to operate because petroleum is usually stored in a petroleum storage tank. And because the space of the petroleum storage tank is large during operation, the petroleum storage tank is pressurized and has high energy consumption for reaching the specified pressure, and the vacuum pressure cover is arranged in the petroleum storage tank, so that the operation is inconvenient.
The utility model patent CN219064867U discloses a breather valve detection device, which needs to add a connecting valve between a storage tank and a breather valve, namely the breather valve needs to be detached from the storage tank, which can cause gas in the petroleum storage tank to escape and pollute the environment, and does not meet the national requirement on environmental protection.
The existing breather valve detection device cannot meet the requirements of online breather valve detection, the detection effect is poor, the detection operation is inconvenient, and the detection cost is high.
Disclosure of Invention
The utility model aims to solve the technical problems that: the on-line detection device and the detection method for the breather valve can be used for detecting the breather valve on line, are simple in detection operation and can meet the national detection standard.
The technical scheme adopted for solving the technical problems is as follows: the on-line detection device for the breather valve comprises a mounting frame, a flowmeter, a flexible gas storage unit, a pressure switch, a first valve, a second valve and a pressure transmitter, wherein the mounting frame is detachably arranged on a breather valve mounting pipe of a storage tank; a camera and an anemometer are installed in the flexible gas storage unit, the camera detects the opening heights of an inhalation end valve disc and an exhalation end valve disc of the breather valve, and the anemometer measures the air flow velocity at the exhaust port.
The camera and the anemometer are arranged in the exhaust port of the breather valve; or the camera and the anemometer are installed outside the discharge port and disposed toward the discharge port.
Preferably, the mounting frame is disc-shaped, the mounting frame is formed by splicing two semicircular plates, and the two semicircular plates are fixedly connected through the anchor ear.
Preferably, the mounting frame on be provided with test runner and detection runner, test runner and the one end that detects the runner all set up on the up end of mounting frame and with detect the chamber intercommunication, test runner and the other end that detects the runner all set up the lateral part at the mounting frame, test runner and detection runner symmetry set up in the both sides of mounting frame, test runner and pressure switch intercommunication, detect runner and second valve intercommunication.
Preferably, the flexible gas storage unit is a flexible cover, and the lower end of the flexible cover is fixedly connected with the mounting frame.
Preferably, the flexible gas storage unit comprises a cylinder, a positive pressure maintaining device and a negative pressure maintaining device; the upper end of the cylinder is sealed, the lower end of the cylinder is in sealing connection with the mounting frame, a detection cavity is formed in the cylinder, the positive pressure retaining device and the negative pressure retaining device are both arranged on the cylinder, and the positive pressure retaining device and the negative pressure retaining device are both communicated with the detection cavity.
Preferably, the negative pressure retaining device comprises a cylinder body, a piston rod and a balancing weight, wherein the cylinder body is vertically arranged, the piston is slidably arranged in the cylinder body, the piston rod is arranged at the lower side of the cylinder body, the upper end of the piston rod slidably stretches into the cylinder body and is fixedly connected with the bottom of the piston, the detection cavity is communicated with a rodless cavity of the cylinder body, and the balancing weight is fixedly connected with the piston rod.
Preferably, the negative pressure retaining device further comprises a mounting plate, a screw rod and a fixing nut, wherein the mounting plate is fixedly connected with the piston rod, one end of the screw rod is fixedly connected with the mounting plate, the balancing weight is annular, the balancing weight is sleeved outside the screw rod, the fixing nut is connected with the screw rod, and the balancing weight is pressed on the mounting plate.
Preferably, the top of the cylinder is also connected with a buffer device.
Preferably, the buffer device comprises a sealing disc, a lower buffer spring, a guide rod, an upper buffer spring and a top cover, wherein the sealing disc is slidably arranged in the cylinder and is used for sealing the upper end of the cylinder, the top cover is detachably connected with the top end of the cylinder, the lower buffer spring is in a compressed state and is positioned in the cylinder, the upper end of the lower buffer spring is supported on the top cover, the lower end of the lower buffer spring is supported on the sealing disc, the lower end of the guide rod is fixedly connected with the sealing disc, the upper end of the guide rod slidably penetrates through the top cover and is in threaded connection with an adjusting sleeve, the upper buffer spring is in a compressed state, and the upper buffer spring is positioned between the adjusting sleeve and the top cover.
Preferably, the discharge port is detachably connected with a support frame, the camera and the anemometer are fixed on the support frame, a pressing device is further arranged on the outer side of the support frame, and the pressing device is pressed at the outer end of the discharge port;
the support frame include fixed mounting pole, movable mounting pole and supporting shoe, the outer end of fixed mounting pole is provided with the installation blind hole, the one end slidable of movable mounting pole stretches into in the installation blind hole, be provided with fastening bolt on the fixed mounting pole, fastening bolt's tip stretches into in the installation blind hole and compresses tightly the movable mounting pole, the supporting shoe rotates the other end of connecting at the movable mounting pole, is provided with the torsional spring between supporting shoe and movable mounting pole.
The detection method of the online detection device for the breather valve comprises the following steps:
compressed gas is introduced into the detection cavity through an air compressor or a gas cylinder, and the suction end valve disc is detected through a camera until the suction end valve disc acts and is opened, and the pressure value of the pressure transmitter at the moment is recorded, namely the negative pressure opening pressure;
the detection cavity is pumped with negative pressure through a vacuum pump or a gas cylinder, and the expiration end valve disc is detected through a camera until the expiration end valve disc acts and is opened, and the pressure value of the pressure transmitter at the moment is recorded, namely positive pressure opening pressure;
after the inspiration end valve disc or the expiration end valve disc is opened to a set height, reading the indication number of the anemometer, and calculating the ventilation volume of the breather valve;
introducing compressed air or pumping negative pressure into the detection cavity to enable the pressure value in the detection cavity to be positive pressure opening pressure which is 0.75 times or enable the negative pressure value in the detection cavity to be negative pressure opening pressure which is 0.75 times, and measuring the total amount of air entering or exiting the flexible air storage unit in a specified time through a flowmeter at the moment, wherein the total amount of air entering or exiting the flexible air storage unit is the leakage amount of the breather valve;
maintaining the pressure in the detection cavity at the positive pressure opening pressure, and shooting the opening height of the valve disc at the air suction end by the camera;
the negative pressure value in the detection cavity is made to be negative pressure opening pressure, and at the moment, the camera shoots the opening height of the valve disc at the expiration end.
Preferably, the camera shoots the opening process of the air suction end valve disc, records the opening height curve of the air suction end valve disc along with the pressure change in the detection cavity, and detects whether the air suction end valve disc is smoothly opened;
and shooting an opening process of the expiration end valve disc by using a camera, recording an opening height curve of the expiration end valve disc along with the pressure change in the detection cavity, and detecting whether the expiration end valve disc is smoothly opened.
Through detecting the open height curve of inhaling end valve disc and expiration end valve disc, detect inhaling end valve disc and expiration end valve disc and open smoothly, can judge whether phenomenon such as jamming appears in inhaling end valve disc and expiration end valve disc opening in-process to overhaul the breather valve in time, avoid appearing the trouble in the follow-up use.
Preferably, the anemometer is arranged opposite to the center of the discharge port;
when the ventilation of the breather valve is calculated, firstly, calculating a detection conversion ventilation value according to the flow velocity measured by the anemometer and the area of the exhaust port, and multiplying the detection conversion ventilation value by a correction coefficient to obtain the ventilation of the breather valve; the correction coefficient is 0.7-0.9.
Preferably, the light source is arranged on the expiration end valve disc and the inspiration end valve disc.
Compared with the prior art, the utility model has the following beneficial effects:
this breather valve on-line measuring device can realize detecting the breather valve on line, need not pull down the breather valve by the storage tank, and directly can realize the detection to the breather valve in the outside of storage tank, detects the negative pressure opening pressure of breather valve through outside pressurization, detects positive pressure opening pressure through outside application negative pressure, detects convenient operation, and can not influence the normal use of storage tank.
The detection method can detect the positive pressure opening pressure, the negative pressure opening pressure, the ventilation volume, the leakage volume and the opening height of the breather valve, meets the national requirements on detection standards, and ensures accurate detection effect of the breather valve.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment 1 of a breather valve in-line detection device.
Fig. 2 is a partial enlarged view at a in fig. 1.
Fig. 3 is a schematic front sectional view of the mount of embodiment 1.
FIG. 4 is a schematic view of the camera and anemometer mounting structure in example 1.
Fig. 5 is a schematic diagram of the calculation of the opening height of the exhalation end valve disk in embodiment 1.
Fig. 6 is a schematic diagram showing an ideal state of raising the exhalation end valve disk in example 1.
Fig. 7 is a schematic diagram showing the occurrence of the clamping stagnation during the rising of the exhalation end valve disk in example 1.
Fig. 8 is a schematic diagram showing the repeated lifting and lowering phenomenon during the lifting of the exhalation end valve disc in example 1.
Fig. 9 is a schematic front sectional view of the flexible air storage unit in example 2.
Fig. 10 is a partial enlarged view at B in fig. 9.
Fig. 11 is a schematic front view of the supporting frame in embodiment 3.
Fig. 12 is a cross-sectional view at E-E in fig. 11.
Fig. 13 is a partial enlarged view of fig. 12 at C.
Fig. 14 is a partial enlarged view at D in fig. 12.
Fig. 15 is a schematic view showing the mounting of the support frame to the discharge port in embodiment 3.
Fig. 16 is a schematic view showing the supporting block of the supporting frame in embodiment 3 fixed to the inner end of the discharge port.
FIG. 17 is a schematic view of a camera and anemometer mounting structure in example 4.
In the figure: 1. a storage tank; 2. a respiratory valve; 201. a breather valve body; 202. a discharge port; 203. a suction end valve disc; 204. an exhalation end valve disc; 3. a gas cylinder; 4. a test tube; 5. a first valve; 6. a flow meter; 7. a pressure switch; 8. a camera; 9. a flexible gas storage unit; 901. a cylinder; 902. a top cover; 903. a sealing plate; 904. a lower buffer spring; 905. a guide rod; 906. an adjusting sleeve; 907. a cylinder; 908. a piston; 909. an end cap; 910. a piston rod; 911. a mounting plate; 912. balancing weight; 913. a fixing nut; 914. an upper buffer spring; 915. a support plate; 10. an anemometer; 11. a second valve; 12. a pressure transmitter; 13. a mounting frame; 1301. testing a flow channel; 1302. detecting a flow channel; 1303. a hoop; 1304. a groove; 1305. a through hole; 14. a mounting rod; 15. a fixed mounting rod; 1501. installing a blind hole; 16. a movable mounting rod; 1601. a mounting groove; 1602. a limit part; 17. a fastening bolt; 18. a support block; 19. a locking sleeve; 20. a connecting pipe; 21. a pressing rod; 2101. fixing the compression bar; 2102. a movable compression bar; 22. a connecting ring; 23. and (3) a bracket.
Detailed Description
Fig. 1 to 8 are diagrams illustrating preferred embodiments of the present utility model, and the present utility model is further described below with reference to fig. 1 to 17.
Example 1
As shown in fig. 1-2: the on-line detection device for the breather valve comprises a mounting frame 13, a flow meter 6, a flexible gas storage unit 9, a pressure switch 7, a first valve 5, a second valve 11 and a pressure transmitter 12, wherein the mounting frame 13 is detachably arranged on a breather valve mounting pipe of a storage tank 1, the breather valve mounting pipe is in sealing arrangement with the mounting frame 13, the flexible gas storage unit 9 is arranged on the upper side of the mounting frame 13, a closed detection cavity is formed between the flexible gas storage unit 9 and the mounting frame 13, the breather valve 2 is positioned in the detection cavity, the test pipe 4 is communicated with the detection cavity after being sequentially connected with the first valve 5, the flow meter 6 and the pressure switch 7 in series, and the pressure transmitter 12 is communicated with the detection cavity after being connected with the second valve 11 in series; a camera 8 and an anemometer 10 are mounted in the outlet 202 of the breather valve 2. The negative pressure opening pressure of the breather valve 2 is detected through external pressurization, the positive pressure opening pressure is detected through external application of negative pressure, the detection operation is convenient, and the normal use of the storage tank 1 is not influenced. The first valve 5 and the second valve 11 in this embodiment are ball valves.
The mounting frame 13 is mounted on the breather valve mounting pipe, and sealing arrangement is arranged between the mounting frame 13 and the breather valve mounting pipe, and sealing can be realized by arranging a sealing rubber pad between the mounting frame 13 and the breather valve mounting pipe. The flexible gas storage unit 9 sets up the upside at mounting bracket 13, and in this embodiment, flexible gas storage unit 9 is the flexible cover of rubber material, and the flexible cover sets up the upside at mounting bracket 13, and detachable sealing connection between flexible cover downside and the mounting bracket 13 to form the detection chamber in the flexible cover, flexible cover downside just can realize sealing connection between them through clamp fixed connection mounting bracket 13. The breather valve 2 is located in the detection chamber.
Compressed gas is introduced into the flexible gas storage unit 9, which is equivalent to the pressure reduction in the storage tank 1 to enable the breather valve 2 to inhale, and negative pressure is pumped into the flexible gas storage unit 9, which is equivalent to the pressure increase in the storage tank 1 to enable the breather valve 2 to exhale.
The right side of the breather valve main body 201 of the breather valve 2 is provided with a discharge port 202, an inhalation end valve disk 203 and an exhalation end valve disk 204 are both provided in the breather valve main body 201, and the inhalation end valve disk 203 and the exhalation end valve disk 204 are respectively located on both sides of the discharge port 202.
The breather valve main body 201 is connected with the breather valve mounting pipe of the storage tank 1 through a flange plate at the bottom, when the pressure in the storage tank 1 is increased, the breather end valve disc 204 moves upwards at the moment, and the gas in the storage tank 1 is discharged through the discharge port 202; when the pressure in the tank 1 decreases, the suction valve disc 203 moves upward, and the external air enters the breather valve 2 through the discharge port 202, and supplements the tank 1.
One end of the test tube 4 is connected with the gas cylinder 3, the gas cylinder 3 is a compressed gas cylinder or a negative pressure gas cylinder, compressed gas can be provided through the compressed gas cylinder, and then positive pressure is generated in the detection cavity. Negative pressure can be pumped to the detection cavity through the negative pressure gas cylinder, and then people enable the detection cavity to generate negative pressure. The gas cylinder 3 may also be replaced by an air compressor or a vacuum pump.
The output end of the test tube 4 is communicated with the input port of the first valve 5, the output port of the first valve 5 is communicated with the flowmeter 6, and the flowmeter 6 is used for detecting the gas amount entering or exiting the detection cavity, and in this embodiment, the flowmeter 6 is an accumulation type flowmeter. The output port of the flowmeter is communicated with the input port of the pressure switch 7, the output port of the pressure switch 7 is communicated with the detection cavity, and the pressure switch 7 is used for controlling the speed of gas flowing into or discharging out of the detection cavity.
The input port of the second valve 11 is communicated with the detection cavity, and the output port of the second valve 11 is communicated with the detection port of the pressure transmitter 12.
The camera 8 and the anemometer 10 are both installed in the middle of the outlet 202 of the breather valve 2, and the camera 8 is used for detecting the opening and closing of the exhalation end valve disc 204 and the inhalation end valve disc 203 in real time, and can detect the opening heights of the inhalation end valve disc 203 and the exhalation end valve disc 204, so as to calculate the opening height curves of the inhalation end valve disc 203 and the exhalation end valve disc 204 along with the pressure change in the detection cavity. The anemometer 10 is used to detect the displacement and thus the ventilation of the breather valve 2.
As shown in fig. 3: the mounting bracket 13 is discoid, and mounting bracket 13 is formed by the concatenation of two semicircular plates, and the middle part of two semicircular plates all is provided with the ventilation groove, and the ventilation groove concatenation of two semicircular plates becomes through-hole 1305 to with breather valve installation pipe cooperation. The mounting bracket 13 is installed on the breather valve installation tube through staple bolt 1303, and staple bolt 1303's both sides respectively with two semicircular dish fixed connection, the both sides of staple bolt 1303 pass through bolt fixed connection, and then make two semicircular dish splice into mounting bracket 13 to make it fix on the breather valve installation tube.
Be provided with test runner 1301 and detect runner 1302 on the mounting bracket 13, test runner 1301 and the one end that detects runner 1302 all set up on the up end of mounting bracket 13 to all with detect the chamber intercommunication, test runner 1301 and the other end that detects runner 1302 all set up the lateral part at mounting bracket 13, test runner 1301 and detect runner 1302 symmetry setting in the both sides of mounting bracket 13. One end of the test flow channel 1301, which is located at the side of the mounting frame 13, is communicated with the output port of the pressure switch 7, and one end of the test flow channel 1302, which is located at the side of the mounting frame 13, is communicated with the input port of the second valve 11.
A groove 1304 is also provided around the sides of the mounting bracket 13, the groove 1304 being used for a secure connection and seal with the flexible cover.
In this embodiment, the flexible cover is hemispherical or cylindrical with a closed upper end, and the bottom of the flexible cover is sleeved outside the mounting frame 13 and is fixedly connected with the mounting frame 13 through the clamp, so that the effect of flexible gas storage can be achieved by utilizing the elasticity of rubber materials.
Referring to fig. 4, a mounting rod 14 is arranged at the exhaust port 202 of the breather valve 2, two mounting rods 14 are arranged perpendicular to each other, the mounting rod 14 is fixedly connected with the exhaust port 202, the camera 8 and the anemometer 10 are both mounted on the mounting rod 14, and the camera 8 and the anemometer 10 are both positioned in the middle of the exhaust port 202.
Because the flexible cover covers the whole breather valve 2, the light is insufficient when the camera 8 shoots, light sources are arranged on the expiratory valve disc 204 and the inspiratory valve disc 203 of the breather valve 2, and the camera 8 shoots the light sources directly at the moment, so that the shooting of the positions of the expiratory valve disc 204 and the inspiratory valve disc 203 can be realized, and the phenomenon that the camera 8 cannot accurately capture images of the expiratory valve disc 204 and the inspiratory valve disc 203 due to insufficient light is avoided.
In this embodiment, the data of the camera 8 and the anemometer 10 are transmitted to the computer by wireless transmission.
The utility model also provides a detection method of the online detection device for the breather valve, which comprises the following steps:
compressed air is slowly introduced into the detection cavity through the air compressor or the air bottle 3, the air suction end valve disc 203 is detected through the camera 8 until the air suction end valve disc 203 acts and is opened, and the pressure value of the pressure transmitter 12 at the moment is recorded, namely the negative pressure opening pressure.
The negative pressure is slowly pumped into the detection cavity through the vacuum pump or the gas cylinder 3, the expiration end valve disc 204 is detected through the camera 8 until the expiration end valve disc 204 acts and is opened, and the pressure value of the pressure transmitter 12 at the moment is recorded, namely the positive pressure opening pressure.
When the opening pressure test is carried out, namely, the positive pressure opening pressure and the negative pressure opening pressure are detected, the pressure in the flexible gas storage unit 9 is gradually increased or reduced through the positive pressure source and the negative pressure source, and the opening pressure test is carried out. The pressure values were read by pressure transmitter 12 at the time of the test, once per minute, and the arithmetic average of 3 pressure values was taken.
After the inspiration end valve disk 203 or the expiration end valve disk 204 is opened to a set height, the set height is generally 30% of the nominal diameter of the inspiration end valve disk 203 or the expiration end valve disk 204, and the indication of the anemometer 10 is read to calculate the ventilation of the breather valve 2.
In order to ensure accuracy of the detection result when detecting the ventilation amount, it is generally necessary to detect and average the wind speed at each position of the outlet 202, and the more the number of monitoring points, the more accurate the detection result. However, since the breather valve 2 and the anemometer 10 are both installed in the flexible cover, the position adjustment of the anemometer 10 is inconvenient. The inventors therefore installed the anemometer 10 at the center of the discharge port 202 and calculated the ventilation amount by the correction coefficient. That is, the ventilation amount=the detection equivalent ventilation amount value is a correction coefficient, and the correction coefficient is usually 0.7 to 0.9, and the correction coefficient is determined according to the diameter and shape of the discharge port 202. The detected equivalent ventilation value is the ventilation value calculated from the wind speed detected by the anemometer 10 and the area of the discharge port 202. The ventilation of the breather valve 2 is calculated to determine whether the ventilation requirement when the exhalation end valve disc 204 or the inhalation end valve disc 203 is opened to a set height is satisfied.
And placing the anemometer 10 with 0.5-1.0 level precision at a specified position according to the requirement to perform ventilation test. The flow velocity value is read once every minute by a computer and three times, the flow velocity is the arithmetic average value of the measuring points, and then the accurate value is obtained according to the database.
And introducing compressed air or pumping negative pressure into the detection cavity to enable the pressure value in the detection cavity to be 0.75 times of positive pressure opening pressure or enable the negative pressure value in the detection cavity to be 0.75 times of negative pressure opening pressure, and measuring the total amount of air entering or exiting the flexible air storage unit 9 in a specified time through the flowmeter 6 at the moment, namely the leakage amount of the breather valve.
The leak test pressure was 0.75 times the cracking pressure and the pressure value was read on a precision manometer. The constant pressure state inside the flexible gas storage unit 9 is kept by using a constant negative pressure control system, the total amount of gas entering the flexible gas storage unit 9 in a specified time is calculated by the flowmeter 6, namely the leakage amount of the breather valve 2 (the precision level of the flowmeter 6 is 0.5-1.0 level), the measurement and reading are carried out once per minute, three times are taken, and an arithmetic average value is obtained.
Maintaining the pressure in the detection cavity at the positive opening pressure, and shooting the opening height of the air suction end valve disc 203 by the camera 8; the negative pressure value in the detection cavity is set to be the negative pressure opening pressure, and at the moment, the camera 8 shoots the opening height of the exhalation end valve disc 204.
Placing the camera 8 in a prescribed position, and beginning to measure the opening heights of the inhalation-end valve disc 203 and the exhalation-end valve disc 204 in the vicinity of the exhalation or inhalation pressure value of the breather valve 2; and before and after reaching the opening pressure value, randomly extracting 3 times of measured values, wherein the measured values are not less than 30% of the nominal diameter, and the breather valve 2 meets the requirements. In this process, the computer reads the pressure value and uses the video tool to automatically capture the action heights of the inspiration end valve disk 203 and the expiration end valve disk 204 for a plurality of times according to the range, and the computer displays the value correctly through an algorithm.
Referring to fig. 5, after capturing an image of the valve disc by the camera 8, the elevation of the valve disc can be calculated, specifically, taking the exhalation-end valve disc 204 as an example:
the height L0 is the difference between the lens center line of the camera 8 and the exhalation end valve disc 204 when the exhalation end valve disc 204 is in the closed position, D0 is the linear distance between the camera 8 and the exhalation end valve disc 204, and two values L0 and D0 are determined when the camera 8 is mounted and can be obtained by actual measurement.
Ln is the intermediate arbitrary height position of the exhalation end valve disc 204 in the raised position, calculated by measuring the distance Dn from the center of the lens to the exhalation end valve disc 204 by the camera 8,。
LH is the highest position where the end-expiratory valve disc 204 rises, i.e. the opening height position of the end-expiratory valve disc 204 that should be measured, DH is the distance from the center of the lens to when the end-expiratory valve disc 204 rises to the final opening position,。
it should be noted that when the center of the lens of the camera 8 is lower than the closed position of the exhalation end valve disc 204, L0 assumes a value of zero.
In fig. 6-8, L is the valve disc opening height and P is the pressure provided by the pressure source.
Referring to fig. 6, in an ideal rising state of the exhalation end valve disc 204, the opening height of the exhalation end valve disc 204 increases smoothly with an increase in pressure provided by the pressure source.
Referring to fig. 7, beginning at P1, the exhalation-end valve disc 204 rises to give rise to a stuck phenomenon, and the pressure increases, but the valve disc temporarily stops rising; when the pressure increases to P2, the exhalation end valve disc 204 continues to rise smoothly to fully open.
Referring to FIG. 8, beginning at P3, the exhalation end valve disc 204 is suddenly raised and lowered instead of being smoothly raised; until the pressure increases to P4, the exhalation end valve disc 204 continues to rise smoothly to fully open.
Through recording and image processing of the motion tracks of the expiratory end valve disc 204 and the inspiratory end valve disc 203, the opening heights of the expiratory end valve disc 204 and the inspiratory end valve disc 203 are calculated respectively, and correct judgment is given to whether clamping stagnation and change of movement speed and whether sudden high and low phenomena occur in the motion, and whether to replace the valve disc or even the whole respiratory valve is determined according to the severity of the clamping stagnation and the sudden high and low phenomena.
When the negative pressure is pumped to the flexible gas storage unit 9, a vacuum pump can be used for pumping the negative pressure on site, and the vacuum pump can be a portable small vacuum pump.
Because the storage tank 1 corresponding to the utility model is a normal pressure or micro-pressure storage tank, the positive pressure opening pressure and the negative pressure opening pressure of the breather valve 2 are smaller, and the detection of the positive pressure opening pressure and the negative pressure opening pressure of the breather valve 2 can be completed through the small pressure or the small negative pressure.
Example 2
As shown in fig. 9-10: example 2 differs from example 1 in that: the flexible gas storage unit 9 comprises a cylinder 901, a positive pressure retaining device and a negative pressure retaining device, wherein the cylinder 901 is a rigid cylinder, and is more suitable for detecting the breather valve 2 with the diameter of more than 500 mm. The top of drum 901 seals the setting, and the bottom lock is in the upside of mounting bracket 13, and the bottom and the detachable sealing connection of mounting bracket 13 of drum 901 can set up sealed the pad in order to form sealedly between drum 901 and mounting bracket 13 to form the detection chamber in drum 901. The positive pressure maintaining device and the negative pressure maintaining device are both arranged on the cylinder 901 and are respectively positioned at two opposite sides of the cylinder 901, the positive pressure maintaining device can maintain stable positive pressure in the cylinder 901, and the negative pressure maintaining device can maintain stable negative pressure in the cylinder 901 so as to ensure that the detection result is more accurate.
The positive pressure holding means has the same structure as the negative pressure holding means, and the positive pressure holding means is attached to the left side of the cylinder 901 in the drawing, and the negative pressure holding means is attached to the right side of the cylinder 901 in the drawing. In this embodiment, the structure and the operation principle of the positive pressure holding device and the negative pressure holding device will be described by taking the structure of the positive pressure holding device as an example.
The positive pressure holding device includes a cylinder 907, a piston 908, a piston rod 910, a mounting plate 911, a weight 912, a screw, and a fixing nut 913. The cylinder 907 is vertically arranged, the top of the cylinder 907 is opened, and the bottom of the cylinder 907 is communicated with the cylinder 901. The piston 908 is slidably installed in the cylinder 907, and is in sealing arrangement with the cylinder 907, an end cover 909 is detachably installed at the top of the cylinder 907, the lower end of the piston rod 910 is slidably connected with the top of the piston 908 after penetrating through the end cover 909, the upper end of the piston rod 910 is fixedly connected with the mounting plate 911, and a cylinder breathing port communicated with the inner cavity of the cylinder 907 is arranged on the end cover 909, so that the interference to the lifting of the piston 908 is avoided. The mounting panel 911 is installed in the upside of piston rod 910, and the vertical installation of screw rod is in mounting panel 911 upside, and balancing weight 912 is the ring, and balancing weight 912 cover is outside the screw rod, and the upper end threaded connection of screw rod has fixation nut 913, and fixation nut 913 compresses tightly balancing weight 912 on mounting panel 911.
Because the weight of the piston 908, the piston rod 910, the mounting plate 911 and the balancing weight 912 determines, when the pressure in the cylinder 901 is greater than the rated pressure, the piston 908 moves upwards, so that the pressure in the cylinder 901 can be constant, the constant pressure in the cylinder 901 can be adjusted by adjusting the weight of the balancing weight 912, and the pressure in the cylinder 901 cannot exceed the designated pressure.
The negative pressure maintaining device also comprises a cylinder 907, a piston 908, a piston rod 910, a mounting plate 911, a balancing weight 912, a screw rod and a fixing nut 913, wherein the piston 908 is slidably arranged in the cylinder 907, the upper end of the piston rod 910 is slidably extended into the cylinder 907 and fixedly connected with the bottom of the piston 908, the detection cavity is communicated with the rodless cavity of the cylinder 907, the balancing weight 912 is fixedly connected with the piston rod 910, and the difference between the negative pressure maintaining device and the positive pressure maintaining device is that the piston rod 910 of the negative pressure maintaining device is positioned at the lower side of the piston 908. When in the initial state, the piston 908 of the positive pressure holding device moves to the lowest side of the cylinder 907 under the action of the balancing weight 912, and at this time, the piston does not affect the negative pumping pressure in the cylinder 901; in the initial state, the piston 908 of the negative pressure holding device is located on the underside of the cylinder 907, which does not affect the positive pressure of the cylinder 901. In order to avoid interference between the negative pressure holding device and the tank 1, a pipe may be provided between the cylinder 907 of the negative pressure holding device and the cylinder 901 so that the cylinder 907 of the negative pressure holding device avoids the tank 1, thereby avoiding interference between the tank 1 and the cylinder 907 of the negative pressure holding device.
The flexible gas storage unit 9 in this embodiment further includes a buffer device provided on the upper side of the cylinder 901, the buffer device being capable of protecting when the pressure in the cylinder 901 exceeds a specified value and exceeds the pressure value of the positive pressure holding device and the negative pressure value of the negative pressure holding device.
The damping device comprises a sealing disk 903, a lower damping spring 904, an upper damping spring 914, a support plate 915 and a guide bar 905. The top of cylinder 901 is opened and is equipped with top cover 902 detachably, and top cover 902 is equipped with cylinder breathing port to avoid obstruction to lifting sealing plate 903. Sealing disk 903 slidable installs in drum 901, and sealing disk 903 sets up with the drum 901 between the sealing, and guide bar 905 vertical setting, and the lower extreme slidable of guide bar 905 pass behind the top cap 902 with sealing disk 903 fixed connection, and the backup pad 915 is installed to the upper end slidable, and adjustment sleeve 906 and guide bar 905 threaded connection, adjustment sleeve 906 sets up the upside at backup pad 915. The upper buffer spring 914 and the lower buffer spring 904 are both sleeved outside the guide rod 905, and the upper buffer spring 914 and the lower buffer spring 904 are both in a compressed state, wherein the upper buffer spring 914 is positioned between the support plate 915 and the top cover 902, and the lower buffer spring 904 is arranged between the top cover 902 and the sealing disk 903.
The upper buffer spring 914 and the lower buffer spring 904 maintain a balanced state, and when the limit value of the positive pressure holding means or the negative pressure holding means is exceeded when the cylinder 901 is pressurized or negative pressure is pumped, the sealing plate 903 moves in the height direction at this time to achieve adjustment of the pressure.
Example 3
Referring to fig. 11-15, the present embodiment provides a support frame that facilitates mounting of the camera 8 and anemometer 10, the support frame being removably mounted within the discharge port 202, the camera 8 and anemometer 10 being mounted on the support frame.
The support frame includes a plurality of fixed mounting pole 15, movable mounting pole 16 and supporting shoe 18, the outer end of fixed mounting pole 15 is provided with the installation blind hole 1501, the one end slidable of movable mounting pole 16 stretches into in the installation blind hole 1501, the supporting shoe 18 rotates the other end of connecting at movable mounting pole 16, be provided with the torsional spring between supporting shoe 18 and movable mounting pole 16, be provided with fastening bolt 17 on fixed mounting pole 15, fastening bolt 17's tip stretches into in the installation blind hole 1501 and compresses tightly movable mounting pole 16, in order to realize the fixed of movable mounting pole 16 and fixed mounting pole 15.
When the support frame is installed in the discharge port 202, the movable installation rod 16 is first adjusted to enable the support block 18 to protrude outwards from the discharge port 202, and then the support frame is integrally placed in the discharge port 202, and at the moment, the outer end of the support block 18 is pushed by the discharge port 202 to incline outwards. After all the support blocks 18 enter the exhaust port 202, the torsion springs can press the support blocks 18 against the inner wall of the exhaust port 202, so that the support frame is fixed, and the anemometer 10 and the camera 8 are fixed.
A compressing device is further arranged on the outer side of the support frame and compressed at the outer end of the discharge port 202, so that the support frame is ensured to be fixed and reliable. Specifically, the compressing device comprises a connecting pipe 20, a locking sleeve 19, a connecting ring 22 and a compressing rod 21, one end of the connecting pipe 20 is fixedly connected with the supporting frame, the connecting ring 22 is slidably sleeved outside the connecting pipe 20, the locking sleeve 19 is in threaded connection with the connecting pipe 20, and the locking sleeve 19 is positioned outside the connecting ring 22. The inner end of the pressing rod 21 is fixedly connected with the connecting ring 22, and a plurality of pressing rods 21 are uniformly distributed around the connecting ring 22 at intervals.
After the support frame enters the discharge port, the locking sleeve 19 is rotated, so that the locking sleeve 19 is pressed against the connecting ring 22, and then the connecting ring is pressed against the outer wall of the discharge port 202 through the pressing rod 21, thereby ensuring that a sufficient supporting force is maintained between the support block 18 and the inner wall of the discharge port 202, and ensuring that the support frame is supported more reliably.
The compressing rod 21 in this embodiment includes a fixed compression rod 2101 and a movable compression rod 2102, where the inner end of the fixed compression rod 2101 is fixedly connected with the connecting ring 22, and the movable compression rod 2102 is in a circular tube shape and is slidably sleeved outside the fixed compression rod 2101, so that the length of the compressing rod 21 is conveniently adjusted to adapt to the discharge ports 202 with different calibers. The movable compression rod 2102 is connected with a compression bolt in a threaded manner, the end part of the compression bolt compresses the fixed compression rod 2101, the fixed compression rod 2101 and the movable compression rod 2102 are further fixed, the connection position of each fixed installation rod 15 and the movable installation rod 16 can be adjusted, and the installation positions of the camera 8 and the anemometer 10 can be adjusted.
Referring to fig. 16, a mounting groove 1601 is provided at the outer side of the other end of the movable mounting lever 16, and a stopper 1602 is formed at one side of the mounting groove 1601. One end of the supporting block 18 extends into the mounting groove 1601 and is rotatably connected with the movable mounting rod 16, the other end of the supporting block 18 extends out of the mounting groove 1601, the limiting part 1602 has a limiting effect on the supporting block 18, and the torsion spring enables the supporting rod 18 and the movable mounting rod 16 to be located on the same straight line. The support block 18 can be directly pushed into the inner side of the discharge port 202 during installation, the support block 18 is clamped on the inner side of the discharge port 202 by utilizing the limit of the limit part 1602, and finally the support block 18 is pressed on the outer side of the discharge port 202 by utilizing the pressing rod 21, so that the support frame is fixed more firmly.
Example 4
Referring to fig. 17, unlike embodiment 1, the camera 8 and the anemometer 10 in the present embodiment are installed outside the discharge port 202. The camera 8 and the anemometer 10 are installed in the flexible air storage unit 9, the camera 8 and the anemometer 10 are arranged towards the exhaust port 202 of the breather valve 2, and the camera 8 and the anemometer 10 are respectively installed on the upper side of the installation frame 13 through the support 23. The flexible gas storage unit 9 in this embodiment is preferably a flexible cover made of rubber, and the flexible cover can properly deform the camera 8 and the anemometer 10, which is more beneficial to installing the camera 8 and the anemometer 10.
The above description is only a preferred embodiment of the present utility model, and is not intended to limit the utility model in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present utility model still fall within the protection scope of the technical solution of the present utility model.
Claims (8)
1. An on-line detection device for a breather valve, which is characterized in that: the device comprises a mounting frame (13), a flowmeter (6), a flexible gas storage unit (9), a pressure switch (7), a first valve (5), a second valve (11) and a pressure transmitter (12), wherein the mounting frame (13) is detachably arranged on a breather valve mounting pipe of a storage tank (1), the breather valve mounting pipe is arranged between the breather valve mounting pipe and the mounting frame (13) in a sealing mode, the flexible gas storage unit (9) is arranged on the upper side of the mounting frame (13), a closed detection cavity is formed between the flexible gas storage unit (9) and the mounting frame (13), the breather valve (2) is located in the detection cavity, the first valve (5), the flowmeter (6) and the pressure switch (7) are sequentially connected in series, and then the breather valve (12) is communicated with the detection cavity after being connected with the second valve (11) in series; a camera (8) and an anemometer (10) are arranged in the flexible gas storage unit (9), the camera (8) detects the opening heights of an inhalation end valve disc (203) and an exhalation end valve disc (204) of the breather valve (2), and the anemometer (10) measures the air flow rate at the exhaust port (202);
compressed air is introduced into the flexible air storage unit (9), the pressure in the storage tank (1) is reduced to enable the breathing valve (2) to inhale, negative pressure is pumped to the flexible air storage unit (9), the pressure in the storage tank (1) is increased to enable the breathing valve (2) to exhale, the right side of a breathing valve main body (201) of the breathing valve (2) is provided with a discharge port (202), an air suction end valve disc (203) and an air expiration end valve disc (204) are both arranged in the breathing valve main body (201), the air suction end valve disc (203) and the air expiration end valve disc (204) are respectively positioned at two sides of the discharge port (202), the breathing valve main body (201) is connected with an air expiration valve mounting pipe of the storage tank (1) through a flange plate at the bottom, when the pressure in the storage tank (1) is increased, the air expiration end valve disc (204) moves upwards, and gas in the storage tank (1) is discharged through the discharge port (202); when the pressure in the storage tank (1) is reduced, the air suction end valve disc (203) moves upwards, external air enters the breather valve (2) through the exhaust port (202) and supplements air for the storage tank (1), the camera (8) and the anemograph (10) are both arranged in the middle of the exhaust port (202) of the breather valve (2), the camera (8) is used for detecting opening and closing of the air suction end valve disc (204) and the air suction end valve disc (203) in real time, the opening heights of the air suction end valve disc (203) and the air suction end valve disc (204) can be detected, and then an opening height curve of the air suction end valve disc (203) and the air suction end valve disc (204) along with the pressure change in the detection cavity is calculated, and the anemograph (10) is used for detecting the exhaust gas quantity and then detecting the ventilation quantity of the breather valve (2); the flexible gas storage unit (9) comprises a cylinder (901), a positive pressure retaining device and a negative pressure retaining device, the structure of the positive pressure retaining device is the same as that of the negative pressure retaining device, the positive pressure retaining device is arranged on the left side of the cylinder (901) in the drawing, the negative pressure retaining device is arranged on the right side of the cylinder (901) in the drawing, the positive pressure retaining device comprises a cylinder body (907), a piston (908), a piston rod (910), a mounting plate (911), a balancing weight (912), a screw rod and a fixing nut (913), the cylinder body (907) is vertically arranged, the top of the cylinder body (907) is arranged in an opening way, the bottom of the cylinder body (907) is communicated with the cylinder (901), the piston (908) is slidably arranged in the cylinder body (907), an end cover (909) is detachably arranged between the piston (908) and the cylinder body (907), the lower end of the piston rod (910) is slidably arranged through the top of the end cover (909), the lower end of the piston rod (910) is fixedly connected with the top of the piston (908), the upper end of the piston rod (910) is fixedly connected with the mounting plate (911), the end cover (911) is vertically arranged on the piston rod (908) in order to prevent the piston (908) from being arranged on the vertical lifting side of the piston rod (908) to be in the lifting ring (911), the balancing weight (912) is sleeved outside the screw, the upper end of the screw is connected with a fixing nut (913) in a threaded manner, and the fixing nut (913) compresses the balancing weight (912) on the mounting plate (911).
2. The breather valve on-line detection device of claim 1, wherein: the flexible gas storage unit (9) is a flexible cover, and the lower end of the flexible cover is fixedly connected with the mounting frame (13).
3. The breather valve on-line detection device of claim 1, wherein: the top of the cylinder (901) is also connected with a buffer device.
4. The breather valve on-line detection device of claim 1, wherein: the buffering device comprises a sealing disc (903), a lower buffering spring (904), a guide rod (905), an upper buffering spring (914) and a top cover (902), wherein the sealing disc (903) is slidably arranged in the cylinder (901) and is used for sealing the upper end of the cylinder (901), the top cover (902) is detachably connected with the top end of the cylinder (901), the lower buffering spring (904) is in a compressed state, the lower buffering spring (904) is positioned in the cylinder (901), the upper end of the lower buffering spring (904) is supported on the top cover (902), the lower end of the lower buffering spring (904) is supported on the sealing disc (903), the lower end of the guide rod (905) is fixedly connected with the sealing disc (903), the upper end of the guide rod (905) slidably penetrates through the top cover (902) and is in threaded connection with an adjusting sleeve (906), the upper buffering spring (914) is in a compressed state, and the upper buffering spring (914) is positioned between the adjusting sleeve (906) and the top cover (902).
5. The breather valve on-line detection device of claim 1, wherein: the camera (8) and the anemometer (10) are fixed on the support frame, a pressing device is further arranged on the outer side of the support frame, and the pressing device is pressed at the outer end of the discharge port (202);
the support frame include fixed mounting pole (15), movable mounting pole (16) and supporting shoe (18), the outer end of fixed mounting pole (15) is provided with installation blind hole (1501), the one end slidable of movable mounting pole (16) stretches into in installation blind hole (1501), be provided with fastening bolt (17) on fixed mounting pole (15), the tip of fastening bolt (17) stretches into in installation blind hole (1501) and compresses tightly movable mounting pole (16), supporting shoe (18) rotate the other end of connecting at movable mounting pole (16), be provided with the torsional spring between supporting shoe (18) and movable mounting pole (16).
6. A method for detecting a breather valve in-line detecting device according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
compressed air is introduced into the detection cavity through an air compressor or an air bottle (3), the air suction end valve disc (203) is detected through a camera (8) until the air suction end valve disc (203) acts and is opened, and the pressure value of the pressure transmitter (12) at the moment is recorded, namely the negative pressure opening pressure;
the detection cavity is pumped with negative pressure through a vacuum pump or a gas cylinder (3), the exhalation end valve disc (204) is detected through a camera (8) until the exhalation end valve disc (204) acts and is opened, and the pressure value of the pressure transmitter (12) at the moment is recorded, namely positive pressure opening pressure;
after the inspiration end valve disk (203) or the expiration end valve disk (204) is opened to a set height, reading the indication of the anemometer (10) and calculating the ventilation quantity of the breather valve (2);
introducing compressed air or pumping negative pressure into the detection cavity to enable the pressure value in the detection cavity to be positive pressure opening pressure which is 0.75 times or enable the negative pressure value in the detection cavity to be negative pressure opening pressure which is 0.75 times, and measuring the total air quantity which enters or exits the flexible air storage unit (9) in a specified time through the flowmeter (6) at the moment, namely the leakage quantity of the breather valve (2);
maintaining the pressure in the detection cavity at a positive pressure opening pressure, and shooting the opening height of the air suction end valve disc (203) by the camera (8);
the negative pressure value in the detection cavity is set to be negative pressure opening pressure, and at the moment, the camera (8) shoots the opening height of the expiration end valve disc (204).
7. The method of detecting according to claim 6, wherein: the camera (8) shoots the opening process of the air suction end valve disc (203), records the opening height curve of the air suction end valve disc (203) along with the pressure change in the detection cavity, and detects whether the air suction end valve disc (203) is smoothly opened;
and the camera (8) shoots the opening process of the expiration end valve disc (204), records the opening height curve of the expiration end valve disc (204) along with the pressure change in the detection cavity, and detects whether the expiration end valve disc (204) is smoothly opened.
8. The method of detecting according to claim 6, wherein: the anemometer (10) is arranged opposite to the center of the discharge port (202);
when the ventilation quantity of the breather valve (2) is calculated, firstly, calculating a detection conversion ventilation quantity value according to the flow velocity measured by the anemometer (10) and the area of the exhaust port (202), and multiplying the detection conversion ventilation quantity value by a correction coefficient to obtain the ventilation quantity of the breather valve (2); the correction coefficient is 0.7-0.9.
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| CN202311551579.6A CN117268742B (en) | 2023-11-21 | 2023-11-21 | On-line detection device and detection method for breather valve |
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| CN202311551579.6A CN117268742B (en) | 2023-11-21 | 2023-11-21 | On-line detection device and detection method for breather valve |
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| CN117268742A (en) | 2023-12-22 |
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